import VectorSource from 'ol/source/Vector';
import {Vector as VectorLayer} from 'ol/layer';
import {Style} from 'ol/style';
import Feature from 'ol/Feature';
import {Circle} from 'ol/geom';

const circleFeature = new Feature({
  geometry: new Circle([12127398.797692968, 4063894.123105166], 5000),
});
circleFeature.setStyle(
  new Style({
    renderer(coordinates, state) {
      const [[x, y], [x1, y1]] = coordinates;
      const ctx = state.context;
      const dx = x1 - x;
      const dy = y1 - y;
      const radius = Math.sqrt(dx * dx + dy * dy);

      const innerRadius = 0;
      const outerRadius = radius * 1.4;

      const gradient = ctx.createRadialGradient(
        x,
        y,
        innerRadius,
        x,
        y,
        outerRadius
      );
      gradient.addColorStop(0, 'rgba(0,0,255,0)');
      gradient.addColorStop(0.6, 'rgba(0,0,255,0.2)');
      gradient.addColorStop(1, 'rgba(255,0,0,0.8)');
      ctx.beginPath();
      ctx.arc(x, y, radius, 0, 2 * Math.PI, true);
      ctx.fillStyle = gradient;
      ctx.fill();

      ctx.arc(x, y, radius, 0, 2 * Math.PI, true);
      ctx.strokeStyle = 'rgba(0,0,255,1)';
      ctx.stroke();
    },
  })
);


function getCustomCircleLayer() {
  return new VectorLayer({
    source: new VectorSource({
      features: [circleFeature],
    }),
  });
}

export {
  getCustomCircleLayer
}